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Proceedings Paper

Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites
Author(s): Xiaofan Deng; Xiaoming Wen; Rui Sheng; Shujuan Huang; Takaaki Harada; Tak W. Kee; Martin A. Green; Anita Ho-Baillie
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Paper Abstract

Methylammonium Lead Bromide (CH3NH3PbBr3) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH3NH3PbBr3. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH3NH3PbBr3 by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH3NH3PbBr3 is in contact with compact TiO2 (c-TiO2) layer, suggesting better quality CH3NH3PbBr3. when deposited on c-TiO2. The nanosecond decay in CH3NH3PbBr3 film is ascribed to electron-hole recombination. With the presence of c-TiO2 layer, this process is accelerated due to electron transport across the CH3NH3PbBr3/ c-TiO2 interface.

Paper Details

Date Published: 22 December 2015
PDF: 6 pages
Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 966848 (22 December 2015); doi: 10.1117/12.2202330
Show Author Affiliations
Xiaofan Deng, The Univ. of New South Wales (Australia)
Xiaoming Wen, The Univ. of New South Wales (Australia)
Rui Sheng, The Univ. of New South Wales (Australia)
Shujuan Huang, The Univ. of New South Wales (Australia)
Takaaki Harada, The Univ. of Adelaide (Australia)
Tak W. Kee, The Univ. of Adelaide (Australia)
Martin A. Green, The Univ. of New South Wales (Australia)
Anita Ho-Baillie, The Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 9668:
Micro+Nano Materials, Devices, and Systems
Benjamin J. Eggleton; Stefano Palomba, Editor(s)

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